You create a following screen.

For details about Alarm, please refer following topic.
About Alarm
You can learn how to design Alarm in this section.
You create a following variable (Var2).
| [Name] | [Type] | [Source] | [Address] |
| Var2 | [BOOL] | [Schneider Modbus TCP/IP Equipment1] | 000001 |
For details about how to create variable, please refer following topic.
Creating Variables
For details about Script, please refer following topic.
About Script
You can confirm your project behavior by Simulation.